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NASA ready for GRAIL spacecraft to crash into moon

In a series of planned maneuvers, NASA's twin GRAIL spacecraft, nicknamed Ebb and Flow, will crash into a crater rim near the moon's North Pole about 2:28 p.m. Pacific time on Monday.

At a news conference on Thursday, scientists involved with the project, which is operated out of the Jet Propulsion Laboratory in La Cañada-Flintridge, spoke about their work's end.

"The mission is almost over, it’s kind of sad to me," said David Lehman, GRAIL project manager.

On Friday morning, he said, engineers at JPL would fire the engines to point the twin crafts, which are about the size of the washer-dryers you'd find in an apartment, toward their mountain target. Following that maneuver, they will turn off the spacecrafts' science instruments.

Well with it's scientific mission complete and it's purpose fulfilled, who cares what happens to them. Their mission was to map the moons surface gravity and they have completed that objective.

Having the high-resolution gravity map helps scientists learn more about lunar composition and, by extension, the makeup and history of other rocky planets and planetary bodies in the solar system, the researchers said. To cite just one example, Zuber noted that the team had learned that the lunar crust is far thinner than scientists had believed, which means the lunar mantle (the layer below the crust) has possibly been exposed by crater impacts. Studying exposed lunar mantle should help planetary scientists understand the Earth's mantle, she said.
Further information about GRAIL findings is available at the mission website, which is maintained by NASA.